Bolt-lock



(No Model.)

J. T. BERRY.

BOLT LOOK.

No. 248,393. Patented Oct. 18,1881.

@iutmsm:

NITED. STATES PATENT OFFICE.

JOHN T. BERRY, OF PARIS, TEXAS.

BOLT-LOCK.

SPECIFICATION forming part of Letters Patent No. 248,393, dated October 18, 1881.

Application filed June 23, 1881. (No model.)

To all whom it may concern:

Be it known thatI, J OHNT.BERRY, of Paris, in the county of Lamar and State of Texas, have invented certain newand useful Improvementsin Bolt-Locks; and I do hereby declare that the following is a full, clear, and exact description ofthe invention, which will enable others skilledin the artto which itappertainsto make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which forma part of this specification.

This invention relates to certain new and useful improvements in bolt-locks; and it consists of a single piece of heavy washer-iron, of any desired form, having a recess or shoulder formed in its edge, and also having two or more countersunk holes through its body, as will be hereinafter more fully set forth.

In the annexed drawings, which fully illustrate my device, Figure l is a top view, and Fig. 2 is a view showing my device applied to a bolt.

Similar letters refer to similar parts.

A represents my device, preferably constructed, as shown in the drawings, of a circular piece of heavy washer-iron, having countersunk holes a a through its body for the insertion of nails or screws.

B represents an oblong shoulder or recess formed in the edge of the said plate A.

0 represents an ordinary bolt, having the usual square shank, c, and D represents a nut screwed upon the threaded end of the bolt 0.

When a bolt is driven through wood so that its shank will fit tight against the material surrounding it, it is a well-knownfact that if the nut should become rusted on the threaded end of the bolt the pressure which must be exerted to unscrew the nut will be communicated from the nut to the bolt, and the torsion thus brought into play ol'the shank, bearing against the surrounding material, will wear away said material and make a hole large enough to permit the entire bolt to be turned when the nut is being unscrewed hence it will be found impossible to remove the nut, as it is necessary that the shank should beheld rigid when the nut is being unscrewed. The frequent removing of the nut or bolt will also have the same efl'ect.

Ithas been usual heretofore to overcome this defect by applying a wrench or a pair of tongs to the head of the bolt and hold it rigid while the pressure is being exerted on the nutat the other end; but this method is very often inconvenient, as it frequently requires the work of two persons instead of one, and also because the tools are not always to be had on the instant.

By the use of my device these objections are entirely overcome, as it is not liable to be worn out, no matter how great the pressure exerted against it, and it also acts as a wrench, and has the advantage of always beingin place. Furthermore, it is cheap. very simple, and easily constructed, and may be attached to any size of bolt.

The operation of my device is as follows: The oblong recess B, which is formed in the edge of the plate A, is placed around the shank 0, directly beneath the head of the bolt. and surrounds it on three of its sides. Nails or screws are then inserted in the countersunk holes a a and driven into the material through which the bolt is driven, thus forming a bearing for the shank c, which cannot be turned or worn by the pressure of the said shank against it, and by this means it supplies a long-felt want.

It is obvious that my device, when it is de sired, may be countersunk in the material through which it is desired to drive the bolt.

1 am aware that bolt locks and washers have been provided with apertures for the passage of the bolt and with suitable openings for the attaching screws or nails; but I am not aware that such washers or locks have. been formed with a recess extending from the periphery of the bolt-lock toward its center.

Nut-locks have also been used in which a notched bar combined with a flanged nut holds the latter in place and prevents it from turning. In this and similar devices the notched plate or bar is designed to secure the nut, while my device is intended to obviate the liability of wearing a bolt-hole by the torsion of the bolt, and its consequent injurious pressure against the wood which is exerted at every effort to unscrew or tighten a nut upon the bolt.

Having thus fully described my device, what ICO I claim as new, and desire to secure by Letters I Patent, is

The combination, with a bolt, (3, having In testimony that I claim the foregoing as my own I have hereto affixed my signaturein presence of two witnesses.

JOHN T. BERRY.

Witnesses:

D. H. Soon, '1. T. SANDERS. 

